MULTIPROTOCOL SERIAL COMMUNICATIONS INTERFACE (SCI-M)
MULTIPROTOCOL SERIAL COMMUNICATIONS INTERFACE (Cont’d)
10.5.3 Functional Description
The SCI-M has four operating modes:
– Asynchronous mode
Asynchronous mode, Asynchronous mode with
synchronous clock and Serial expansion mode
output data with the same serial frame format. The
differences lie in the data sampling clock rates
(1X, 16X) and in the protocol used.
– Asynchronous mode with synchronous clock
– Serial expansion mode
– Synchronous mode
Figure 107. SCI -M Functional Schematic
INPL (*)
INTCLK
XBRG
RX buffer
register
RX shift
register
Baud rate
generator
Sin
LBEN (*)
RXclk
1
LBEN
Divider by 16
0
CD
1
OUTPL (*)
XRX
INPEN (*)
OCKPL (*)
Divider by 16
0
TX shift
register
Sout
CD
OCLK
AEN
OUTSB (*)
TXbuffer
register
DCDEN (*)
Polarity
AEN (*)
Enveloper
OCLK
Polarity
OCKSB (*)
XTCLK
AEN (*)
RTSEN (*)
VR02054
TXclk / CLKout
DCD
RTS
The control signals marked with (*) are active only in synchronous mode (SMEN=1)
Note: Some pins may not be available on some devices. Refer to the device Pinout Description.
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STMICROELECTRONICS [ ST ]
